print('Введите скобочную последовательность:')
s=input()
s1=''


for char in s:
    if char == "(":
        s1+=char

    if char == ")":
        if len(s1)>0:
            if s1[len(s1)-1] == "(":
                s1 = s1[:-1]

    if char == "[":
        s1+=char

    if char == "]":
        if len(s1)>0:
            if s1[len(s1)-1] == "[":
                s1 = s1[:-1]

    if char == "{":
        s1 += char

    if char == "}":
        if len(s1) > 0:
            if s1[len(s1) - 1] == "{":
                s1 = s1[:-1]

    if char == "<":
        s1 += char

    if char == ">":
        if len(s1) > 0:
            if s1[len(s1) - 1] == "<":
                s1 = s1[:-1]
    print(s1)

if len(s1)==0:
    print("верная")
else:
    print("Неверная")